Hoisting-machine



um OI mm M A n S 1 J0 H (No Model.)

Patented Sept. 29, 1891.

ATTORNEY.

WITNESSES UNITED Y STATES PATENT OFFICE.

JOHN ALLENSON, OF ST. PAUL, MINNESOTA.

HOISTING- MACHINE.

SPECIFICATION forming part of Letters Patent No. 460,491, datedSeptember 29, 1891. A

Application filed March 2, 1891.

To aZZ whom it may concern: Be it known that I, JOHN ALLENsoN, a citizenof the United States, residing at St. Paul,

in the county of Ramsey and State of Minnesota, have invented certainnew and useful Improvements in Hoisting-Machines; and I do declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same, reference being had to the accompany ingdrawings, and to the figures of reference marked thereon, which form apart of this specification.

This invention relates to hoisting-machines, and is of that particularclass in which horsepower is generally employed as the motive force.

The object of the invention is to obviate the necessity in throwing thedrum-shaft into or out of operative connection with the drivin g-shaftor changing the speed of the former, of moving a gear upon either shaft,or by raising or lowering the drum-shaft bodily, one of which methods iscommonly employed. The chief objections to these constructions are thecomplexity of mechanism necessary to accomplish the desired result, thelack of stability under load of the movable parts, and especially theliability to breakage of cogs and straining of shaft and bearings causedby throwing a stationary gear into mesh with a revolving one or thereverse, which latter disadvantage is common to both constructions abovereferred to.

The present invention consists in the construction and arrangement ofparts hereinafter described, whereby the gears of the driving-shaft areat all times fully in mesh with those upon the drum-shaft and may berespectively thrown into and out of operative connection with thedriving-shaft itself at the will of the attendant without changing theposition of the gears or shaft, and at the same time securing a moresimple, effective, and inexpensive construction.

The invention also consists in the means employed for throwing off thedru n1-retai nin g dog in connection with the lever for controlling theconnection between the driving and drum shafts at the point when thetwoare Serial No. 383,493- (No model.)

entirely disconnected without the necessity of operating a second lever.

The invention is illustrated in the accompanying drawings, in whichFigure 1 represents an end elevation, partially in section, of myimproved hoistingmachine; Fig. 2, a side elevation of the same, alsopartly in section; and Fig. 3, a detail view of the throwing-offmechanism controlling the drum-dog.

Upon a suitable base 1, generally of wood, is mounted the ironframe-work 2, supporting and furnishing bearings for the operative partsof the machine. These consist of an upright shaft 3, adapted to carry atits upper extremity a suitable sweep 4 for the attachment of horse orsimilar motive power, and a horizontal drum-shaft in connectiontherewith or adapted to be disconnected therefrom at the will of theoperator. driving-shaft at its upper extremity is mounted in a suitablebearing 5 at the upper part of the frame, which may be furnished with alining or bearing-surface of Babbitt or similar metal, and at its basein a step-bearingG at the lower part of the frame. Between the twobearings are carried two bevelgears 7 and 8, loose upon the shaft, theupper one 7 supported by a collar 9, carried by arms 10, formed in onepiece with the frame, and the lower one 8 supported upon the lower partof the frame around the stepbearing 6. The collar 9 may be cast in onepiece with the frame by forming the same in U shape, leaving one side ofthe same open for a width equal to the diameter of its curved part forthe introduction of thehub of the gear 7. In this case itsbearing-surface should be chilled to prevent excessive friction andwear. The adjacent faces of the hubs 11 and 12 of the gears 7 and 8,respectively, are provided with clutch-teeth 13 of any desired form, andbetween the two upon the shaft is located a clutch member 14, havingteeth 15 upon both upper and lower faces, corresponding, respectively,with those upon the hubs. This clutch member isso secured upon the shaftby a key, feather, or otherwise as to rotate with the same and at thesame time be capable of a longitudinal movement with respect thereto inorder that it may be thrown into The engagement with either gear 7 or 8or out of engagement with both, the length of the clutch and thedistance apart of the two hubs being such that when in a positioninterme diate of the two hubs the teeth of the clutch member will clearthose of the hubs. It will thus be seen that either of the gears 7 or 8may be thrown into operative connection with the driveshaft and rotatetherewith, or the shaft may turn without moving either of the gears, andthat the vertical position and bearing of the gears remain the same inall cases.

Upon the horizontal shaft is mounted the winding-drum 16, having rigidlyconnected thereto or to the shaft or preferably formed integral with thedrum the ratchet 1'7, brakewheel 18, and concentric bevel-gears 19 and20, respectively in mesh with the gears 7 and 8. The radius of the gear19 is less than that of the gear 20 by an amount equal to the verticaldistance apart of the two cog-faces of the gears 7 and S. Whichever ofthe two gears 7 and 8 is in operative connection with the driving-shaftcontrols the speed of the winding-drum, while the other gear moves idlyupon the driving-shaft by the impulse of its mate upon the drum-shaft.

The position of the movable clutch member 14: is controlled by means ofa lever 21, pivoted upon the frame, as at 22, and carrying at oneextremity a collar 23, lying in a circumferential groove 24: upon theclutch member. The lever 21 is forked at its inner extremity andsupports the collar 23 bymeans of pins or lugs 25, formed upon orsecured to the latter in diametrically-opposite positions an d passingthrough or into the extremities of the arms of the fork. The outerextremity of the lever 21 is connected with a rack-bar 26, working in aguide 27 upon the frame, which rack is in mesh with a segmentpinion 28,carried by a hand-lever 29, pivoted upon the frame. The operation of thelever 29 will thus raise or lower the clutch member 14 upon thedriving-shaft to cause its engagement with either of the gears 7 8 orhold it in an intermediate position between the two. The lever 29 isprovided with a catch 30 in position to engage with notches 31, 32, and33 upon a segment-bar 34: to retain the lever in either of the threepositions required for the several positions of the clutch member.

The brake-band 35, controlled by lever 36, is of usual form, and a dog37, hinged to the base 1 in position to engage with the drum ratchet-rim17, serves as a detent to prevent the backward movement of the drum.\Vhen, however, it becomes necessary to allow the hoisting-rope tounwind from the drum, the dog is disengaged from the ratchet in thefollowing manner simultaneously and by the same operation necessary tothrow both driving-shaft gears out of operation. The dog or detent 37 isprovided with a spur, lug, or projection 38, which rests upon asomewhatelastic lever 39, fulcrnmed at a point about midway between the dog andthe frame 2, as at 40. Upon the back of the frame 2 is mounted insuitable guides, so as to move vertically, a bar 41, with its lowerextremity resting upon the lever 39 and having a projection 42,with

a rounded upper face, in position to be engaged and depressed by asimilar lug or projection 43, carried by the hand-lever 29, when thelatter comes into its middle positionthat is, when in position to throwthe clutch member 14 out of engagement with both gears 7 and 8. The barll being thus depressed, the outer extremity of the lever 39 is raised,thus lifting the dog 37 out of engagement with its ratchet. The weightof the dog will generally suffice to throw the bar 41 back into normalposition when disengaged from the lug upon the lever 29; but if not, thelever 39 may be extended beyond the dog and its outer extremity providedwith a weight 44. The lever 39 is held in position by passing betweenthe ears of the bracket 45, in which the end of the brake-lever ismounted.

I claim as my invention- 1. The combination, with the drum, of twoconcentric bevel-gears of different diameters formed upon or secured tothe drum at one extremity thereof, a driving-shaft disposed at rightangles to the axis of the drum, two bevel-gears loose upon saiddriving-shaft and in mesh, respectively, with said drum-gears, and meansfor operatively connecting said loose gears alternately with saiddriving-shaft to rotate in unison therewith, substantially as and forthe purpose herein specified.

2. The combination, with the drum, of two concentric bevel-gears ofdifferent diameters formed upon or secured to the drum at one extremitythereof, a driving-shaft disposed at right angles to the axis of thedrum, two bevel-gears loose upon said driving-shaft and in mesh,respectively, with said drum-gears, clutch-teeth formed upon theadjacent hub faces of said loose gears, a double clutch member havingcorresponding faces rotating wit-h said driving-shaft, but movablelongitudinally thereon, and means for moving said clutch member intoengagement with either of said loose gears, substantially as and for thepurpose specified.

3. The combination, with the drum, of a ratchet-rim and two concentricbevel-gears of different diameters formed upon or secured to the drum atone extremity thereof, a driving-shaft disposed at right angles to theaxis of the drum, two bevel-gears loose upon said driving-shaft and inmesh, respectively, with said drum-gears, a clutch member longitudinallymovable upon said driving-shaft between said gears and adapted to engagealternately with corresponding clutch-faces upon said loose gears, asegment-lever for operating said clutch member, a detent-pawl adapted toengage with said ratchet-rim, a rocking lever upon the frame, having oneex tremity underneath an extension upon said detent, and a sliding armresting upon the other extremity of said lever and adapted to bedepressed by said clutch-lever when in position to throw the said clutchmember out of engagement with both of said loose gears, substantially asand for the purpose specified.

I 4. In a hoisting-machine, the combination, with the drum having aratchet-rim and two concentric bevel-gears of different diameters, adriving-shaft having loose gears in mesh with said drumgears, and alever adapted to operate clutch mechanism for throwing said gearsalternately into and both gears out of operative connection with saiddriving-shaft, of a detent-pawl adapted to engage with said ratchet-rim,a rocking lever fulcrulned upon the frame and having one extremityunderneath said detent, and a sliding bar having one end resting uponsaid rocking lever and its other extremity in position to be engaged anddepressed by said clutch-lever when in position to throw both gears outof operative connection with the driving-shaft, substantially asspecified.

In testimony whereof I affix my signature 25 in presence of twowitnesses.

JOHN ALLENSON. Witnesses:

' Trros. T. FAUNTLEROY,

F. W. LANE.

